Liquid filter type 667-UV45 for testing wavelength accuracy, content: Holmium/Didymium in perchloric acid, certified at wavelengths: 241, 354, 444, 575, 641, 740, 864 nm, in high quality storage box with DAkkS calibration certificate.

• Broad wavelength spectrum.
• 2 filters in one: Holmiun & Didymium.

Liquid filter 667-UV35 for checking wavelength accuracy, content: Rare Earth, certified at wavelengths: 201; 211; 222; 239; 252 nm, in high quality storage box with DAkkS calibration certificate.

• Specially developed for checking wavelength accuray in the low UV range.